Diabetic kidney disease (DKD), also called diabetic nephropathy, is a common complication of diabetes. Current American Diabetes Association guidance estimates that chronic kidney disease affects about 20–40% of people with diabetes. The condition may develop without noticeable symptoms, so regular urine and blood testing is important for detecting kidney damage early. Medical Review: Dr. Jyoti Bansode, MBBS, MD Medicine, DM Nephrology — more than 10 years of nephrology experience. Quick Answer: What Are the Early Symptoms of Diabetic Kidney Disease? Early diabetic kidney disease often causes no obvious symptoms. The first signs may appear on kidney tests, such as increased albumin in urine or changes in eGFR. As kidney disease progresses, possible symptoms may include: – Foamy or unusually bubbly urine – Swelling in the feet, ankles or around the eyes – Fatigue or weakness – Changes in urination – Nausea or reduced appetite – Itching or muscle cramps – Increasing or difficult-to-control blood pressure Because early diabetic kidney disease is often silent, blood and urine tests are more reliable than waiting for symptoms to appear. What Is Diabetic Kidney Disease? Diabetic kidney disease develops when diabetes damages the small blood vessels and filtering structures inside the kidneys. The kidneys contain microscopic filtering units called glomeruli. Over time, persistently high blood glucose can damage these filters, allowing albumin to leak into the urine and gradually reducing the kidneys’ ability to remove waste from the blood. High blood pressure can further increase stress on the kidneys and accelerate kidney damage. For a broader explanation, read about diabetes and kidney diseases. Why Can Diabetic Kidney Disease Develop Without Symptoms? Kidneys have significant reserve capacity. Early kidney damage may therefore develop while a person still feels completely well. NIDDK notes that most people with diabetic kidney disease do not have symptoms in the early stages. Kidney problems are usually detected through blood and urine tests. A patient can have: No pain + no swelling + normal-looking urine and still have albuminuria or another early kidney abnormality. Who Is at Higher Risk? Not everyone with diabetes develops diabetic kidney disease. Risk may be greater in people who have: Diabetes for many years Persistently high blood glucose High blood pressure Cardiovascular disease Smoking habits Excess body weight Family history of kidney failure Existing kidney abnormalities NIDDK identifies poor blood-glucose control and high blood pressure as especially important risk factors. Type 1 vs Type 2 Diabetes: When Should Kidney Testing Begin? Type 1 Diabetes Current ADA 2026 recommendations advise checking urine ACR and eGFR at least annually once a person has had type 1 diabetes for five years or more. Type 2 Diabetes People with type 2 diabetes should generally have urine ACR and eGFR checked at least once a year from diagnosis, regardless of treatment. Diabetes Journals This difference matters because type 2 diabetes may have been present for years before it is diagnosed. What Are the Earliest Signs of Kidney Damage in Diabetes? The earliest signs are often found on laboratory tests. 1. Albumin in the Urine Albumin is a protein that normally remains in the bloodstream. When the kidney filters are damaged, albumin can begin leaking into urine. This is called albuminuria. The standard test used to measure this is the urine albumin-to-creatinine ratio (UACR). For more detail, see the Urine ACR Test Guide. 2. Changes in eGFR The estimated glomerular filtration rate (eGFR) estimates how well the kidneys are filtering blood. A declining eGFR can indicate reduced kidney function. 3. Changes in Serum Creatinine Creatinine is a waste product normally filtered from the blood by the kidneys. As filtration worsens, serum creatinine may increase. However, creatinine alone is not enough to assess early diabetic kidney disease. 4. Increasing Blood Pressure High blood pressure can damage kidney blood vessels, while kidney disease can also make blood pressure more difficult to control. Patients with persistent blood-pressure problems can read more about resistant hypertension. The Two Most Important Tests for Diabetic Kidney Disease The two key kidney markers are: Urine ACR (UACR) eGFR NIDDK specifically identifies urine albumin and eGFR as the two major markers used to detect and monitor chronic kidney disease. Urine Albumin-to-Creatinine Ratio (UACR) UACR measures albumin in urine relative to creatinine. A random spot urine sample is usually sufficient, meaning a 24-hour urine collection is generally unnecessary for routine screening. Typical categories include: UACR Result Interpretation UACR Result Interpretation Below 30 mg/g Normal to mildly increased 30–300 mg/g Moderately increased albuminuria Above 300 mg/g Severely increased albuminuria A UACR above 30 mg/g is considered abnormal, but the result should be interpreted with other kidney tests and, when appropriate, repeat measurements. eGFR eGFR estimates kidney filtration. In general: 60 or above: may be within an acceptable range depending on the clinical situation Below 60: may indicate kidney disease if the reduction persists 15 or below: represents severely reduced kidney function and may indicate kidney failure The result should always be interpreted alongside urine albumin and the patient’s medical history. Can You Have Diabetic Kidney Disease with a Normal eGFR? Yes. A person may have: Normal or relatively preserved eGFR + elevated urine ACR and still have evidence of kidney damage. Albuminuria can appear before significant changes in eGFR. This is why checking only creatinine or eGFR may miss early kidney damage. How to Understand UACR and eGFR Together How to Understand UACR and eGFR Together UACR eGFR What It May Suggest Normal Normal Current kidney markers may be reassuring. High Normal Possible early kidney damage. Normal Low Reduced kidney filtration requiring evaluation. High Low Kidney damage with reduced filtration may be present. This table is a general guide only. Diagnosis depends on repeat testing, trends over time and the patient’s overall clinical condition. Learn more about combined kidney testing in Kidney Tests Explained. Can a High Urine ACR Be Temporary? Yes. A single elevated urine ACR does not always mean permanent kidney damage. Factors that can temporarily raise UACR include: – Vigorous exercise within the previous 24 hours – Infection –
